JPH0626343B2 - Modulator / demodulator data transmission rate automatic switching system - Google Patents
Modulator / demodulator data transmission rate automatic switching systemInfo
- Publication number
- JPH0626343B2 JPH0626343B2 JP63316468A JP31646888A JPH0626343B2 JP H0626343 B2 JPH0626343 B2 JP H0626343B2 JP 63316468 A JP63316468 A JP 63316468A JP 31646888 A JP31646888 A JP 31646888A JP H0626343 B2 JPH0626343 B2 JP H0626343B2
- Authority
- JP
- Japan
- Prior art keywords
- channel
- data transmission
- sub
- unit
- transmission rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 title claims description 46
- 238000005259 measurement Methods 0.000 claims description 12
- 238000012549 training Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/206—Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Artificial Intelligence (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Communication Control (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は変復調装置に関し，特に変復調装置のデータ伝
送速度を自動的に切替える方式に関する。The present invention relates to a modulator / demodulator, and more particularly to a system for automatically switching the data transmission rate of the modulator / demodulator.
従来，変復調装置において，データ伝送速度の切替を行
なう場合は，センター側及びリモート側共に自動等化器
から出力される複素信号をオシロスコープの２次元画面
上に表示してアイパターンをモニターすることによりデ
ータ伝送の受信信号を評価し，センター側及びリモート
側の少なくともいずれか一方のアイの劣化が激しけれ
ば，データ伝送速度を下げ，センター側とリモート側が
共にアイの劣化がなければ，データ伝送速度を上げてい
た。Conventionally, in the modulation / demodulation equipment, when switching the data transmission rate, by displaying the complex signal output from the automatic equalizer on both the center side and the remote side on the two-dimensional screen of the oscilloscope and monitoring the eye pattern. Evaluate the received signal of data transmission. If the deterioration of at least one of the eye on the center side and the remote side is severe, reduce the data transmission rate. If there is no eye deterioration on both the center side and the remote side, reduce the data transmission rate. Was raised.
上述した従来のデータ伝送速度の切替方式は手動による
ものであり，センタ側及びリモート側に共に人手が必要
であり，常時アイパターンのモニターをする必要があり
莫大な時間と経費を要するという欠点がある。The above-mentioned conventional method of switching the data transmission rate is a manual method, and both the center side and the remote side require manpower, and it is necessary to monitor the eye pattern at all times, which requires enormous time and cost. is there.
本発明の課題は，上記欠点を除去し，データ伝送速度の
切替を自動的に行うことのできる変復調装置のデータ伝
送速度の自動切替方式を提供することにある。An object of the present invention is to eliminate the above-mentioned drawbacks and to provide an automatic data transmission rate switching system of a modulation / demodulation device capable of automatically switching the data transmission rate.
本発明によれば，副チャネルを有する変復調装置におい
て，データ伝送速度をＮ（Ｎは自然数）段階切替えを行
なうことのできるデータチャネル変調部と，副チャネル
を変調する副チャネル変調部と，データチャネル変調信
号と副チャネル変調信号とを結合する結合部と，受信信
号のデータチャネルのみを取り出す第１のフィルタと，
受信信号の副チャネルのみを取り出す第２のフィルタ
と，前記第１のフィルタの出力を復調し，データ伝送速
度をＮ（Ｎは自然数）段階切替えを行なうことのできる
データチャネル復調部と，前記第２のフィルタの出力を
復調する副チャネル復調部と，前記データチャネル復調
部の出力を入力とし判定誤差電力を測定する判定誤差電
力測定部と，前記データチャネル復調部の出力を入力と
しS/N比を測定するS/N比測定部と，前記データチャネル
復調部の出力を入力とし発散した回数をカウントするト
レーニング回数測定部と，データ伝送速度毎にS/N比測
定結果と判定誤差電力測定結果と発散回数のスレッショ
ルドを持ち，前記データチャネル変調部と前記データチ
ャネル復調部のデータ伝送速度を切替える制御部とを含
むことを特徴とする変復調装置のデータ伝送速度切替方
式が得られる。According to the present invention, in a modulator / demodulator having a sub-channel, a data channel modulator capable of switching the data transmission rate in N (N is a natural number) stages, a sub-channel modulator for modulating the sub-channel, and a data channel. A combiner for combining the modulated signal and the sub-channel modulated signal, a first filter for extracting only the data channel of the received signal,
A second filter for extracting only the sub-channel of the received signal; a data channel demodulation unit capable of demodulating the output of the first filter to switch the data transmission rate in N (N is a natural number) stages; A sub-channel demodulation unit for demodulating the output of the second filter, a judgment error power measuring unit for measuring the judgment error power with the output of the data channel demodulation unit as an input, and an S / N with the output of the data channel demodulation unit as an input. S / N ratio measurement unit, a training number measurement unit that counts the number of times of divergence with the output of the data channel demodulation unit as an input, S / N ratio measurement result and judgment error power measurement for each data transmission rate A threshold having a result and the number of divergence times and including a control unit that switches the data transmission rate of the data channel modulation unit and the data channel demodulation unit. Data transmission speed switching mode devices are obtained.
次に，本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は，本発明の一実施例の構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.
伝送路２４及び２５を介して副チャネルを持つ変復調装
置２２及び２３が接続されている。副チャネルを持つ変
復調装置２２には，データ伝送速度をＮ（Ｎは自然数）
段階切替えを行なうデータチャネル変調部１とデータチ
ャネル復調部４と，制御部１１からのデータ伝送を切替
えるようにというコマンドを変調する副チャネル変調部
２と，データチャネル変調部１の出力と副チャネル変調
部２の出力との結合を行なう結合部３と，受信信号の中
よりデータチャネル分を取り出すフィルタ６と，受信信
号の中より副チャネル分を取り出すフィルタ７と，副チ
ャネルを復調する副チャネル復調部５と，判定誤差電力
を測定する判定誤差電力測定部８と，S/N比を測定するS
/N比測定部９と，発散した回数をカウントするトレーニ
ング回数測定部１０より構成される。Modulation / demodulation devices 22 and 23 having sub-channels are connected via transmission lines 24 and 25. The data transmission rate is N (N is a natural number) for the modulator / demodulator 22 having the sub-channel.
The data channel modulation unit 1 and the data channel demodulation unit 4 that perform the step switching, the sub-channel modulation unit 2 that modulates the command to switch the data transmission from the control unit 11, the output of the data channel modulation unit 1, and the sub-channel A combining unit 3 for combining with the output of the modulating unit 2, a filter 6 for extracting a data channel component from the received signal, a filter 7 for extracting a sub channel component from the received signal, and a sub channel for demodulating the sub channel. Demodulation unit 5, judgment error power measuring unit 8 for measuring judgment error power, and S for measuring S / N ratio
It is composed of an / N ratio measuring unit 9 and a training number measuring unit 10 for counting the number of divergence.
また，副チャネルを持つ変復調装置２３には，受信信号
の中からデータチャネル分を取り出すフィルタ１２と，
受信信号の中から副チャネル分を取り出すフィルタ１３
と，制御部１８からの命令によりデータ伝送速度をＮ
（Ｎは自然数）段階に切替えを行なうデータチャネル復
調部１４と，データチャネル変調部１９と，データ伝送
速度を切替えるようにというコマンドを復調する副チャ
ネル復調部１５と，判定誤差電力を測定する判定誤差電
力測定部１６と，S/N比を測定するS/N比測定部１７と，
判定誤差電力の測定結果とS/N比の測定結果と制御部１
８からのデータ伝送速度を切替えたというコマンドを変
調する副チャネル変調部２０と，データチャネル変調部
１９の出力と副チャネル変調部２０の結合を行なう結合
部２１とで構成されている。Further, the modulator / demodulator 23 having a sub-channel has a filter 12 for extracting data channels from the received signal,
Filter 13 for extracting subchannels from the received signal
And the data transmission rate is set to N by the command from the control unit 18.
(N is a natural number) The data channel demodulation unit 14 that performs switching to the stage, the data channel modulation unit 19, the sub-channel demodulation unit 15 that demodulates the command to switch the data transmission rate, and the determination that measures the determination error power. Error power measuring unit 16, S / N ratio measuring unit 17 for measuring S / N ratio,
Judgment error Power measurement result, S / N ratio measurement result, and control unit 1
It is composed of a sub-channel modulator 20 for modulating the command for switching the data transmission rate from the signal No. 8 and a coupler 21 for coupling the output of the data channel modulator 19 and the sub-channel modulator 20.
上記の構成において，副チャネルを持つ変復調装置２２
及び２３が共に，データ伝送速度を16.8kbps,14.4kbps,
12.0kbpsの三段階を選択することができるとする。今，
副チャネルを持つ変復調装置２２及び２３が共に，14.4
kbpsに設定されているとする。In the above configuration, the modulation / demodulation device 22 having a sub-channel
And 23 both have a data transmission rate of 16.8 kbps, 14.4 kbps,
Suppose that it is possible to select three stages of 12.0kbps. now,
Both modulators / demodulators 22 and 23 having sub-channels have 14.4
Suppose it is set to kbps.
伝送線路２４が劣化した場合に，副チャネル復調部５に
おいて，副チャネルを持つ変復調装置２３の測定した判
定誤差電力結果とS/N比測定結果を復調し，制御部１１
に出力し，制御部１１において14.4kbpsのデータ伝送速
度でデータ伝送を行なうには劣化が激しいと判断すれ
ば，制御部１１より副チャネル変調部２に対し相手側の
データ伝送速度を12.0kbpsに切替えるように命令するコ
マンドを出し，コマンドを受信した副チャネル復調部１
５より制御部１８に出力し，制御部１８からデータチャ
ネル変調部１９とデータチャネル復調部１４への命令で
12.0kbpsにデータ伝送速度を切替え，制御部１８からデ
ータ伝送速度を切替を行なったというコマンドを副チャ
ネル変調部２０に出力する。副チャネルを持つ変復調装
置２３がデータ伝送速度を12.0kbpsに切替えを行なった
というコマンドを副チャネル復調部５で復調し，制御部
１１に出力を行ない，制御部１１からデータチャネル変
調部１とデータチャネル復調部のデータ伝送速度を12.0
kbpsに切替えを行なう。When the transmission line 24 deteriorates, the sub-channel demodulation unit 5 demodulates the judgment error power result and the S / N ratio measurement result measured by the modulator / demodulator 23 having the sub-channel, and the control unit 11
If the control unit 11 determines that the deterioration is severe to perform data transmission at the data transmission rate of 14.4 kbps, the control unit 11 sets the data transmission rate of the other side to the sub-channel modulation unit 2 to 12.0 kbps. A sub-channel demodulation unit 1 that issues a command to switch and receives the command
5 to the control unit 18, and the control unit 18 sends an instruction to the data channel modulation unit 19 and the data channel demodulation unit 14.
The command that the data transmission rate is switched to 12.0 kbps and the data transmission rate is switched from the control unit 18 is output to the sub-channel modulation unit 20. The sub-channel demodulation unit 5 demodulates the command that the modulation / demodulation device 23 having the sub-channel has switched the data transmission rate to 12.0 kbps, and outputs it to the control unit 11. From the control unit 11, the data channel modulation unit 1 and the data The data transmission rate of the channel demodulator is 12.0.
Switch to kbps.
また，データ伝送が確立できない場合は，副チャネルを
持つ変復調装置２２で，発散回数をトレーニング回数測
定部でカウントし，その発散回数のカウント結果を制御
物１１に出力する。制御部１１は，あらかじめ設定され
た回数を越えると，相手側のデータ伝送速度を下げるよ
うにというコマンドを副チャネル変調部２に出力し，デ
ータ伝送速度を下げるようにというコマンドを復調する
副チャネル復調部１５から制御部１８に出力し，制御部
１８からデータチャネル復調部１４とデータチャネル変
調部１９のデータ伝送速度を切替えさせるように制御
し，制御部１８からデータ伝送速度を切替えたことを副
チャネル変調部２０に出力し，副チャネルを持つ変復調
装置２３がデータ伝送速度を切替えたことを副チャネル
復調部５で復調し制御部１１に出力し，制御部１１から
の命令によりデータチャネル変調部１４とデータチャネ
ル復調部１９のデータ伝送速度を切替える。If data transmission cannot be established, the divergence number is counted by the training number measuring unit in the modulator / demodulator 22 having the sub-channel, and the count result of the divergence number is output to the control object 11. When the preset number of times is exceeded, the control unit 11 outputs to the sub-channel modulation unit 2 a command to reduce the data transmission rate of the other party and demodulates the command to reduce the data transmission rate. The demodulation unit 15 outputs the data to the control unit 18, and the control unit 18 controls the data channel demodulation unit 14 and the data channel modulation unit 19 to switch the data transmission rates. The data is output to the sub-channel modulator 20, and the sub-channel demodulator 5 demodulates that the modulator / demodulator 23 having the sub-channel has switched the data transmission rate and outputs the demodulated data to the controller 11. The data transmission rates of the unit 14 and the data channel demodulation unit 19 are switched.
以上説明したように本発明は，データ伝送速度毎に持っ
ているS/N比及び判定誤差電力及びトレーニング回数の
スレッショルドにより，トレーニング回数のスレッショ
ルドを越えてデータ伝送が確立しない場合はトレーニン
グ回数によりデータ伝送速度の切替を行ない，又，デー
タ伝送が確立している場合は，S/N比及び判定誤差電力
によりデータ伝送速度の切替を瞬時に行なうことによ
り，データ伝送回線の劣化要因の変動等は自動的に最適
且つ安定に即応することができる効果がある。As described above, according to the present invention, the S / N ratio, the judgment error power, and the threshold of the number of trainings possessed for each data transmission rate are used. If the data transmission rate is switched, or if data transmission is established, by switching the data transmission rate instantaneously according to the S / N ratio and the judgment error power, fluctuations of deterioration factors of the data transmission line, etc. There is an effect that can automatically and optimally and immediately respond.
第１図は本発明の実施例を示すブロック図である。 １，１９……データチャネル変調部，４，１４……デー
タチャネル復調部，３，２１……結合部，６，７，１
２，１３……フィルタ，８，１６……判定誤差電力測定
部，９，１７……S/N比測定部，１０……トレーニング
回数測定部，１１，１８……制御部，２，２０……副チ
ャネル変調部，５，１５……副チャネル復調部，２２，
２３……変復調装置，２４，２５……伝送線路。FIG. 1 is a block diagram showing an embodiment of the present invention. 1, 19 ... Data channel modulation unit, 4, 14 ... Data channel demodulation unit, 3, 21 ... Combining unit, 6, 7, 1
2, 13 ... Filter, 8, 16 ... Judgment error power measuring unit, 9, 17 ... S / N ratio measuring unit, 10 ... Training frequency measuring unit, 11, 18 ... Control unit, 2, 20 ... ... Sub-channel modulator, 5, 15 ... Sub-channel demodulator, 22,
23 ... Modulator / demodulator, 24, 25 ... Transmission line.
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｌ 29/08 Continuation of front page (51) Int.Cl. 5 Identification number Office reference number FI technical display area H04L 29/08
Claims (1)
データ伝送速度をＮ（Ｎは自然数）段階切替えを行なう
ことのできるデータチャネル変調部と，副チャネルを変
調する副チャネル変調部と，データチャネル変調信号と
副チャネル変調信号とを結合する結合部と，受信信号の
データチャネルのみを取り出す第１のフィルタと，受信
信号の副チャネルのみを取り出す第２のフィルタと，前
記第１のフィルタの出力を復調し，データ伝送速度をＮ
（Ｎは自然数）段階切替えを行なうことのできるデータ
チャネル復調部と，前記第２のフィルタの出力を復調す
る副チャネル復調部と，前記データチャネル復調部の出
力を入力とし判定誤差電力を測定する判定誤差電力測定
部と，前記データチャネル復調部の出力を入力としS/N
比を測定するS/N比測定部と，前記データチャネル復調
部の出力を入力とし発散した回数をカウントするトレー
ニング回数測定部と，データ伝送速度毎にS/N比測定結
果と判定誤差電力測定結果と発散回数のスレッショルド
を持ち，前記データチャネル変調部と前記データチャネ
ル復調部のデータ伝送速度を切替える制御部とを含むこ
とを特徴とする変復調装置のデータ伝送速度自動切替方
式。1. A modulator / demodulator having a sub-channel,
A data channel modulation unit capable of performing N (N is a natural number) step switching of the data transmission rate, a sub-channel modulation unit for modulating the sub-channel, and a coupling unit for coupling the data channel modulation signal and the sub-channel modulation signal. , A first filter for extracting only the data channel of the received signal, a second filter for extracting only the sub-channel of the received signal, and the output of the first filter are demodulated to set the data transmission rate to N.
(N is a natural number) A data channel demodulation unit capable of performing step switching, a sub-channel demodulation unit for demodulating the output of the second filter, and an output of the data channel demodulation unit as inputs to measure the decision error power. S / N with the output of the judgment error power measurement unit and the data channel demodulation unit as input
S / N ratio measurement unit, a training number measurement unit that counts the number of times of divergence with the output of the data channel demodulation unit as an input, S / N ratio measurement result and judgment error power measurement for each data transmission rate An automatic data transmission rate switching system for a modulation / demodulation apparatus, which has a threshold value of a result and a divergence number and includes a control section for switching the data transmission rate of the data channel modulation section and the data channel demodulation section.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63316468A JPH0626343B2 (en) | 1988-12-16 | 1988-12-16 | Modulator / demodulator data transmission rate automatic switching system |
| US07/452,071 US4991184A (en) | 1988-12-16 | 1989-12-18 | Data communication system having a speed setting variable with transmission quality factors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63316468A JPH0626343B2 (en) | 1988-12-16 | 1988-12-16 | Modulator / demodulator data transmission rate automatic switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02162944A JPH02162944A (en) | 1990-06-22 |
| JPH0626343B2 true JPH0626343B2 (en) | 1994-04-06 |
Family
ID=18077433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63316468A Expired - Lifetime JPH0626343B2 (en) | 1988-12-16 | 1988-12-16 | Modulator / demodulator data transmission rate automatic switching system |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4991184A (en) |
| JP (1) | JPH0626343B2 (en) |
Families Citing this family (74)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0381949A1 (en) * | 1989-02-01 | 1990-08-16 | Siemens Aktiengesellschaft | Diversity combiner |
| US5125008A (en) * | 1990-03-09 | 1992-06-23 | Scientific-Atlanta, Inc. | Method and apparatus for autoranging, quadrature signal generation, digital phase reference, and calibration in a high speed rf measurement receiver |
| US5359607A (en) * | 1991-11-13 | 1994-10-25 | Motorola, Inc. | Adaptive intermodulation control |
| EP0548939B1 (en) * | 1991-12-26 | 2000-09-13 | Nec Corporation | Transmission power control system capable of keeping signal quality constant in mobile communication network |
| KR100289630B1 (en) * | 1992-07-13 | 2001-05-02 | 리패치 | Wireless LAN output control method and device |
| US6148423A (en) * | 1992-07-22 | 2000-11-14 | Alcatel Cit | Signal transmission performance optimization device in a system for transmitting digital data, especially on an optical link |
| US5465399A (en) * | 1992-08-19 | 1995-11-07 | The Boeing Company | Apparatus and method for controlling transmitted power in a radio network |
| WO1994011955A1 (en) * | 1992-11-06 | 1994-05-26 | Pericle Communications Company | Adaptive data rate modem |
| DE69332367T2 (en) * | 1993-01-07 | 2003-07-03 | Kabushiki Kaisha Toshiba, Kawasaki | Data transmission system with adaptive hybrid ARQ process |
| US5440582A (en) * | 1993-05-28 | 1995-08-08 | Motorola, Inc. | Method and apparatus for determining signal usability |
| CA2125511A1 (en) * | 1993-06-14 | 1994-12-15 | Gordon Bremer | Autorate method for simultaneous transmission of voice and data |
| US5436930A (en) * | 1993-06-14 | 1995-07-25 | At&T Corp. | Simultaneous analog and digital communications with a selection of different signal point constellations based on signal energy |
| EP0643507A1 (en) * | 1993-09-13 | 1995-03-15 | Philips Communication D'entreprise | System and method for adaption of data transmission rate depending on line quality and a modem suitable for use in such a system |
| ZA947317B (en) * | 1993-09-24 | 1995-05-10 | Qualcomm Inc | Multirate serial viterbi decoder for code division multiple access system applications |
| FI94810C (en) * | 1993-10-11 | 1995-10-25 | Nokia Mobile Phones Ltd | A method for identifying a poor GSM speech frame |
| US5590405A (en) * | 1993-10-29 | 1996-12-31 | Lucent Technologies Inc. | Communication technique employing variable information transmission |
| JP3106818B2 (en) * | 1993-11-29 | 2000-11-06 | 株式会社村田製作所 | Digital radio receiving method and apparatus |
| US5790781A (en) * | 1993-12-08 | 1998-08-04 | Intel Corporation | Dynamic scaling of CPU cycle consumption in an I/O subsystem of a computer system |
| US5664095A (en) * | 1993-12-08 | 1997-09-02 | Intel Corporation | Dynamic scaling of CPU cycle consumption in a computer system |
| FR2713855B1 (en) * | 1993-12-15 | 1996-01-19 | Alcatel Telspace | Method for detecting a carrier recovery dropout and for determining the EB / NO ratio of a digital transmission link and device implementing this method. |
| JP2737628B2 (en) * | 1993-12-28 | 1998-04-08 | 日本電気株式会社 | Portable information system |
| KR0181320B1 (en) * | 1994-02-17 | 1999-05-15 | 안쏘니 제이. 살리 주니어 | Method and apparatus for controlling coding rate in communication system |
| EP0715481B1 (en) * | 1994-06-20 | 2003-02-26 | Sony Corporation | base station, mobile station, and radio communication system |
| JP3513916B2 (en) * | 1994-06-20 | 2004-03-31 | 株式会社ニコン | Camera system |
| JP3333053B2 (en) * | 1994-09-05 | 2002-10-07 | 富士通株式会社 | Digital communication device |
| JP3486990B2 (en) * | 1994-12-12 | 2004-01-13 | 株式会社デンソー | Serial communication device |
| US5603088A (en) * | 1995-02-28 | 1997-02-11 | Motorola, Inc. | Method and apparatus for determining a quality level of an analog signal in a radio communication system |
| US5546411A (en) * | 1995-02-28 | 1996-08-13 | Motorola, Inc. | Method and apparatus for adaptively selecting a communication strategy in a selective call radio communication system |
| US5694418A (en) * | 1995-06-13 | 1997-12-02 | Ncr Corporation | System and method for determining EPL message transmission retries |
| US6252898B1 (en) * | 1995-07-19 | 2001-06-26 | Hitachi Denshi Kabushiki Kaisha | Spread spectrum communication method and system wherein data rate of data to be transmitted is changed in accordance with transmission quality |
| KR970013834A (en) * | 1995-08-23 | 1997-03-29 | 사와무라 시코우 | A computing apparatus of transmission rate |
| US5831545A (en) * | 1995-08-25 | 1998-11-03 | Motorola, Inc. | Method and apparatus for adjusting a communication strategy in a radio communication system using location |
| GB2306866B (en) * | 1995-10-26 | 1998-08-05 | Bosch Gmbh Robert | Method of obtaining information about the residual errors in a transmitted channel-decoded digital signal |
| CN1099165C (en) * | 1996-03-18 | 2003-01-15 | 三星电子株式会社 | Viterbi decoder |
| CA2213767A1 (en) * | 1996-08-20 | 1998-02-20 | Norand Corporation | Wireless communication system having reduced noise mode operation capability |
| US5914959A (en) * | 1996-10-31 | 1999-06-22 | Glenayre Electronics, Inc. | Digital communications system having an automatically selectable transmission rate |
| US5940439A (en) * | 1997-02-26 | 1999-08-17 | Motorola Inc. | Method and apparatus for adaptive rate communication system |
| US5828672A (en) * | 1997-04-30 | 1998-10-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Estimation of radio channel bit error rate in a digital radio telecommunication network |
| US6570911B1 (en) * | 1997-06-27 | 2003-05-27 | Intel Corporation | Method and apparatus for controlling modem data pump parameters based on processor loading |
| US9118387B2 (en) * | 1997-11-03 | 2015-08-25 | Qualcomm Incorporated | Pilot reference transmission for a wireless communication system |
| US7184426B2 (en) * | 2002-12-12 | 2007-02-27 | Qualcomm, Incorporated | Method and apparatus for burst pilot for a time division multiplex system |
| US6104512A (en) * | 1998-01-23 | 2000-08-15 | Motorola, Inc. | Method for adjusting the power level of an infrared signal |
| JP3191760B2 (en) * | 1998-03-02 | 2001-07-23 | 日本電気株式会社 | Digital wireless communication system, digital wireless communication method, and recording medium storing digital wireless communication method |
| FI981514A7 (en) * | 1998-07-01 | 2000-01-02 | Nokia Multimedia Network Terminals Oy | Method for monitoring transmission channel quality and digital receiver |
| US7133441B1 (en) | 1999-02-23 | 2006-11-07 | Actelis Networks Inc. | High speed access system over copper cable plant |
| JP3344373B2 (en) * | 1999-07-09 | 2002-11-11 | 日本電気株式会社 | Mobile packet communication system |
| US8064409B1 (en) | 1999-08-25 | 2011-11-22 | Qualcomm Incorporated | Method and apparatus using a multi-carrier forward link in a wireless communication system |
| US6621804B1 (en) * | 1999-10-07 | 2003-09-16 | Qualcomm Incorporated | Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel |
| US6333954B1 (en) * | 1999-10-21 | 2001-12-25 | Qualcomm Incorporated | High-speed ACS for Viterbi decoder implementations |
| US6625226B1 (en) * | 1999-12-03 | 2003-09-23 | Allen Gersho | Variable bit rate coder, and associated method, for a communication station operable in a communication system |
| US6414938B1 (en) * | 2000-02-14 | 2002-07-02 | Motorola, Inc. | Method and system for retransmitting data packets in a communication system having variable data rates |
| US6728218B1 (en) * | 2000-02-14 | 2004-04-27 | Motorola, Inc. | Method of dynamic rate switching via medium access channel layer signaling |
| US6674486B2 (en) * | 2000-05-31 | 2004-01-06 | Sony Corporation | Signal processor and signal processing method |
| DE10035389B4 (en) * | 2000-07-20 | 2005-11-10 | Siemens Ag | Method for data transmission in the access area |
| US6973098B1 (en) * | 2000-10-25 | 2005-12-06 | Qualcomm, Incorporated | Method and apparatus for determining a data rate in a high rate packet data wireless communications system |
| US7068683B1 (en) | 2000-10-25 | 2006-06-27 | Qualcomm, Incorporated | Method and apparatus for high rate packet data and low delay data transmissions |
| EP1346398A2 (en) * | 2000-11-01 | 2003-09-24 | Actelis Networks Ltd. | High speed access system over copper cable plant |
| US7106792B2 (en) * | 2001-06-04 | 2006-09-12 | Qualcomm, Inc. | Method and apparatus for estimating the signal to interference-plus-noise ratio of a wireless channel |
| US6539081B2 (en) | 2001-07-20 | 2003-03-25 | Adtran Inc. | Method of establishing signaling rate for single-line digital subscriber link providing extended range ADSL service with auxiliary pots channel |
| US6775550B2 (en) | 2001-07-20 | 2004-08-10 | Adtran, Inc. | Method of inducing ADSL communication device to transmit at downstream signaling rate optimized for extended range ADSL service with auxiliary pots channel over SDSL link |
| US7031346B2 (en) * | 2001-07-20 | 2006-04-18 | Adtran, Inc. | System for providing extended range ADSL service with auxiliary pots channel over single-line digital subscriber link |
| AUPR679201A0 (en) * | 2001-08-03 | 2001-08-30 | Lucent Technologies Inc. | Path metric normalization of add-compare-select processing |
| US8494063B1 (en) | 2001-09-25 | 2013-07-23 | Netgear, Inc. | System and method for stacking receiver channels for increased system through-put in an RF data transmission system |
| GB2380909A (en) * | 2001-10-09 | 2003-04-16 | Ubinetics | Blind transport format detection via signal power changes |
| JP4084305B2 (en) * | 2001-12-03 | 2008-04-30 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Method for link adaptation processing and transmission power control related to applications |
| WO2004084479A1 (en) * | 2003-03-17 | 2004-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Dual loop signal quality based link adaptation |
| GB2399718A (en) * | 2003-03-18 | 2004-09-22 | Agilent Technologies Inc | Rate adaptive optical communication system |
| US8422380B2 (en) | 2003-03-26 | 2013-04-16 | Sharp Laboratories Of America, Inc. | Dynamically reconfigurable wired network |
| EP2560315B1 (en) * | 2003-08-12 | 2020-04-15 | Godo Kaisha IP Bridge 1 | Radio communication apparatus and pilot symbol transmission method |
| US8891349B2 (en) * | 2004-07-23 | 2014-11-18 | Qualcomm Incorporated | Method of optimizing portions of a frame |
| JP4627182B2 (en) * | 2004-12-03 | 2011-02-09 | 富士通株式会社 | Data communication system and communication terminal device |
| US7730362B2 (en) * | 2006-11-09 | 2010-06-01 | Abbott Medical Optics Inc. | Serial communications protocol |
| US8312098B2 (en) * | 2006-11-09 | 2012-11-13 | Abbott Medical Optics Inc. | Serial communications protocol for safety critical systems |
| US8811200B2 (en) * | 2009-09-22 | 2014-08-19 | Qualcomm Incorporated | Physical layer metrics to support adaptive station-dependent channel state information feedback rate in multi-user communication systems |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3534264A (en) * | 1966-04-15 | 1970-10-13 | Ibm | Adaptive digital communication system |
| US3536840A (en) * | 1969-04-25 | 1970-10-27 | Computer Modem Corp | Digital data transmission system with a variable transmission rate |
| JPS60125053A (en) * | 1983-12-12 | 1985-07-04 | Canon Inc | Data communication system |
| US4756007A (en) * | 1984-03-08 | 1988-07-05 | Codex Corporation | Adaptive communication rate modem |
| JPH06103876B2 (en) * | 1986-06-23 | 1994-12-14 | 日本電気株式会社 | Automatic mating backup and restoration method |
-
1988
- 1988-12-16 JP JP63316468A patent/JPH0626343B2/en not_active Expired - Lifetime
-
1989
- 1989-12-18 US US07/452,071 patent/US4991184A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02162944A (en) | 1990-06-22 |
| US4991184A (en) | 1991-02-05 |
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